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An acid dye is a dye which is a salt of a sulfuric, carboxylic or phenolic organic acid. The salts are often sodium or ammonium salts. Acid dyes are typically soluble in water and possesses affinity for amphoteric fibers while lacking direct dyes' affinity for cellulose fibers.

These dyes are made from synthetic resources such as petroleum byproducts and earth minerals. The first humanmade organic aniline dye, mauveine, was discovered serendipitously by William Henry Perkin in 1856, the result of a failed attempt at the total synthesis of quinine.

Soda Ash Dye Fixer. Soda ash is a mild alkali that promotes the chemical reaction between Procion MX fiber reactive dye and cellulose fiber. Soda ash is also known as sodium carbonate, washing soda, or sal soda.